gdb/

gdb/
	GDB find_pc_partial_function support for STT_GNU_IFUNC.
	* blockframe.c (cache_pc_function_is_gnu_ifunc): New variable.
	(clear_pc_function_cache): Clear it.
	(find_pc_partial_function): Rename to ...
	(find_pc_partial_function_gnu_ifunc): ... this function.  New
	parameter is_gnu_ifunc_p, describe it.  Set *IS_GNU_IFUNC_P.
	(find_pc_partial_function): New wrapper for this function.
	* symtab.h (find_pc_partial_function_gnu_ifunc): New declaration.